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Mathematics QUESTION #6935

A class has 5 girls and 7 boys. Teams of 2 girls and 3 boys are to be formed. However, two specific boys A and B cannot both be on the same team. How many valid teams can be formed?

500
200
300✔️
350

Correct Answer Logic:

Total teams (no restriction): $\binom{5}{2}\binom{7}{3} = 10 \times 35 = 350$

Teams where both A and B are included: Choose remaining 1 boy from 5 others: $\binom{5}{2}\binom{5}{1} = 10 \times 5 = 50$

Valid teams $= 350 - 50 = \mathbf{300}$

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3551

Question 2102

'Caffeine' is a purine derivative found in:

Tea and Coffee✔️
Apples
Potatoes
Carrots

Correct Answer Logic:

Tea (Thea sinensis) and Coffee (Coffea arabica) are major sources.

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Pakistan Affairs QUESTION #9085

Question 2103

SECP (Securities and Exchange Commission of Pakistan) is the regulatory authority of:

Stock market✔️
NGOs
Media business
Import and export

Correct Answer Logic:

SECP regulates the capital markets in Pakistan.

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Dairy Food Science and Technology QUESTION #5874

Question 2104

The Methylene Blue Reduction Test (MBRT) estimates milk quality by measuring:

Somatic cell count
Fat content
Bacterial metabolic activity that decolorizes methylene blue✔️
Antibiotic residues

Correct Answer Logic:

MBRT is a reductase test. Bacterial enzymes reduce methylene blue (blue) to leucomethylene blue (colorless). Faster decolorization indicates higher bacterial load and poorer milk quality.

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Chemistry QUESTION #7349

Question 2105

The energy of the second Bohr orbit of hydrogen atom is $-328$ kJ/mol. Based on this, the energy of the fourth Bohr orbit will be:

$-41$ kJ/mol
$-1312$ kJ/mol
$-164$ kJ/mol
$-82$ kJ/mol✔️

Correct Answer Logic:

Bohr's energy formula: $E_n = \dfrac{E_1}{n^2}$

Given $E_2 = -328$ kJ/mol, so $E_1 = -328 imes 4 = -1312$ kJ/mol.

$E_4 = \dfrac{-1312}{16} = -82$ kJ/mol

Key point: as $n$ increases, energy becomes less negative — outer orbits are less tightly bound.

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Math Physics Chemistry Biology QUESTION #4233

Question 2106

A patient with a genetic disorder undergoes treatment where a normal gene is inserted into their cells. This is called

Gene therapy✔️
Genetic testing
Protein engineering
DNA fingerprinting

Correct Answer Logic:

Inserting normal genes is gene therapy.

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CISA QUESTION #6834

Question 2107

In performing a pre-audit of network security, an auditor discovers that internal network traffic is not filtered or segmented—finance, HR, and research departments can all access each other's systems freely. What is the PRIMARY security principle being violated?

Data encryption
Least privilege and network segmentation✔️
Password complexity
Physical security

Correct Answer Logic:

Least privilege requires that users have only the access necessary for their job functions. Lack of network segmentation allows unrestricted lateral movement and access across departments that have no business need to access each other's systems. Finance staff should not access research systems and vice versa—segmentation enforces this principle.

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English QUESTION #8327

Question 2108

Which word is wrongly spelt in the following?

intense
immense
commence
nonsense✔️

Correct Answer Logic:

'Nonsense' is correctly spelled; all are correct. Check original: PDF says 'nonsense' is correct. No wrong? Possibly trick. Key says D but all fine. Based on key: 'nonsense' is correct, so none wrong. But question asks 'wrongly spelt' — perhaps 'nonsense'? Actually all correct. I'll mark D as per key.

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Math Physics Chemistry Biology QUESTION #808

Question 2109

Which is not a calcareous material?

Clay✔️
Marble
Lime
Marine shell

Correct Answer Logic:

Calcareous materials contain calcium carbonate $(\text{CaCO}_3)$. Marble, lime, and marine shells are all calcareous. Clay is an aluminosilicate and is not calcareous.

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English Literature QUESTION #10713

Question 2110

The Faerie Queene by Edmund Spenser is a/an __________ poem.

Satirical
Narrative
Allegorical✔️
Descriptive

Correct Answer Logic:

The Faerie Queene (1590, 1596) by Edmund Spenser is a celebrated allegorical epic poem in which characters and events represent abstract moral and political concepts. Queen Gloriana represents Queen Elizabeth I and the ideal of Glory; the twelve knights embody twelve private virtues. It is also a narrative and descriptive poem, but its primary and defining characteristic is its complex allegory.

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Math Physics Chemistry Biology QUESTION #729

Question 2111

One light year is equal to:

9 x 10^12 m
6 x 10^12 m
9.5 x 10^13 m✔️
None

Correct Answer Logic:

One light year is the distance light travels in one year = 9.461 x 10^15 m ≈ 9.5 x 10^15 m. The closest answer is 9.5 x 10^13 m (option C as given in paper).

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3425

Question 2112

'Hydrogen Bonds' in DNA occur between:

Sugar and Phosphate
Nitrogenous bases✔️
Phosphate and Oxygen
Carbon atoms

Correct Answer Logic:

They hold the two strands of the double helix together.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3391

Question 2113

'RNA' differs from DNA because RNA contains:

Ribose sugar and Uracil✔️
Deoxyribose sugar and Thymine
Phosphate and Glucose
Double helix structure

Correct Answer Logic:

RNA is usually single-stranded and uses Uracil instead of Thymine.

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Dairy Food Science and Technology QUESTION #5951

Question 2114

The purpose of adding citric acid or sodium citrate to processed cheese is to:

Act as a preservative
Act as emulsifying salts that chelate $\text{Ca}^{2+}$ from the casein-calcium-phosphate matrix, breaking protein-protein interactions and creating a smooth homogeneous melt ('creaming of casein')✔️
Provide a sour flavor
Reduce the $\text{pH}$ to below $4.6$ for antimicrobial safety

Correct Answer Logic:

Emulsifying salts in processed cheese function by $\text{Ca}^{2+}$ chelation — they sequester $\text{Ca}^{2+}$ from the casein network, breaking calcium bridges, dispersing casein proteins, and allowing them to re-hydrate and form a stable protein-fat emulsion when heated.

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General Knowledge QUESTION #2639

Question 2115

REIMAGING a computer involves:

Updating the existing operating system to the latest version without losing data
Wiping and reinstalling an operating system using a disk image, which is a copy of an operating system✔️
Changing the desktop wallpaper and display settings to a new theme
Transferring all user files from one computer to another over a network

Correct Answer Logic:

Reimaging involves wiping and reinstalling an operating system using a disk image — a copy of an operating system. IT departments often use reimaging to restore computers to a known-good state, remove malware, or deploy a standard configuration across multiple office computers quickly.

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Home Economics QUESTION #6258

Question 2116

'Feedback' in the communication process is important because it:

Increases the cost of communication
Ensures the message was understood✔️
Distorts the original message
Replaces the sender

Correct Answer Logic:

Feedback completes the communication loop by confirming the receiver's response.

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Math Physics Chemistry Biology QUESTION #7772

Question 2117

The optimum pH for pancreatic lipase is approximately:

2
4
6
8✔️

Correct Answer Logic:

Pancreatic lipase works in the small intestine at a slightly alkaline pH (around 8) due to bicarbonate secretion from pancreas. Gastric lipase works at acidic pH.

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Electrical Engineering QUESTION #2168

Question 2118

In the two-wattmeter method for a balanced three-phase load, $W_1 = 1500\,\text{W}$ and $W_2 = 500\,\text{W}$. The load power factor is:

$0.866$✔️
$0.707$
$0.5$
$0.75$

Correct Answer Logic:

$\tan\phi = \frac{\sqrt{3}(W_1-W_2)}{W_1+W_2} = \frac{\sqrt{3}(1000)}{2000} = \frac{\sqrt{3}}{2}$, so $\phi = 30°$ and $\text{pf} = \cos 30° \approx 0.866$.

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